play the fool
US /pleɪ ðə fuːl/
UK /pleɪ ðə fuːl/

1.
裝傻, 扮小丑
to behave in a silly or foolish way, often to entertain others or to avoid responsibility
:
•
Stop playing the fool and take this seriously.
別再裝傻了,認真對待這件事。
•
He was always playing the fool to make his friends laugh.
他總是裝傻逗朋友們笑。